Procedures:
1. Open PSoC Designer
5 and create new Chip
Level Project and
select the chip
CY8C24894-24LFXI
in the catalog. Be sure
to select C as the
Main file.
2. Go to User Modules
on the left side of the
main page:
CapsenseCSDCS
D with PRS16rightclickplaceOk.
3. Change the Properties
of CSD: Scanning
Speed: fast,
Resolution: 9.
4. Right-Click
CSDCSD Wizard
fix your settings
according to your
necessities of your
board. i.e.: 2 buttons,
1 slider: then drag and
drop the port and pin
number on the boxes.
5. Add buzzer: user
modules PWMs
PWM8placerigh
t-click PWM8 then fix
global properties and
PWM8 properties for
your board.
6. Get your configuration
files: BuildGenerate
Configuration files for
all.
7. On Workspace
Explorer go to the last
folder and click on the
+ then the + on the
Source Files and open
Main.C.
8. Edit the Main.C and
add the C Program.
9. BuildGenerate/Build
all Projects then
Program your board
with PSoC
Programmer. Be sure
to have
IMAGECRAFT set in
ToolsOptions. In
Programmer be sure
you have selected
Family 24X94 then in
Device choose
CY8C24894-24LFXI.
Then file load
“yourproject.hex” and
then click Program.
10.Lightly touch the
Capsense button and
listen for the buzzer to
go off.
A Single Octave 32 kHz
Auditory Output Device
By: Erick Ruiz and Jeffrey Rollman
UCSD COSMOS 2008
Cluster 1: Adventures in Embedded Computer Systems
August 2, 2008
-Can a PSoC device be programmed to allow for auditory output?
-Is it possible to create a workable external CapSensing device that can overcome issues
associated with accuracy, signal loss and wiring difficulties?
-How can reliable pin connections be maintained with the large number of pins needed?
Notes Function:
int playNote(int freq, int time)
{int out_freq = 32000/freq;
int time_val = 32000/time;
return out_freq;
}
char frequency;
Sample for Initialization:
LCD_1_Start();
M8C_EnableGInt;
CSD_1_Start();
LCD_1_Position(0,0); LCD_1_PrCString("Note:
");
CSD_1_InitializeBaselines() ;//init baseline (start
up scanning sensors)
CSD_1_SetDefaultFingerThresholds() ;
Sample for Notes’ Frequency:
struct noteNames notes;
notes.C4
=261.63;
notes.C4Sharp =277.18;
notes.D4
=293.66;
notes.D4Sharp =311.13;
notes.E4
=329.63;
Sample for Sharp Note:
if(CSD_1_bIsSensorActive(2) &&
CSD_1_bIsSensorActive(0))
{
frequency = playNote(notes.C4Sharp,100);
PWM8_1_WritePeriod(frequency);
PWM8_1_WritePulseWidth(20);//|------C4#-------|
PWM8_1_Start();
LCD_1_Position(0,7);
LCD_1_PrCString("C#");
}
Sample for a note:
//Notes Middle C (C4) 1 higher Octave C (C5)
else if(CSD_1_bIsSensorActive(2))
{
frequency = playNote(notes.C4,100);
PWM8_1_WritePeriod(frequency);
PWM8_1_WritePulseWidth(20);//|------C4-------|
PWM8_1_Start();
LCD_1_Position(0,7);
LCD_1_PrCString("C ");
}
else if(CSD_1_bIsSensorActive(3))
{
frequency = playNote(notes.D4,100);
PWM8_1_WritePeriod(frequency);
PWM8_1_WritePulseWidth(20);//|------D4-------|
PWM8_1_Start();
LCD_1_Position(0,7);
LCD_1_PrCString("D ");
}
-Copper electric tape
-Assorted wires and capacitors
-Acrylic Plexiglas boards
-MiniProg programming device
Software Used:
Designer 5.0 (C programming language)
-Cypress Semiconductor’s PSoC
Programmer
-A Windows computer
-PSoC Designer 5.0 can be used to program a digital entertainment device
-An external CapSensing device can be created on Plexiglas acrylic
-Input from CapSense can create an output of varying sounds from PSoC circuit board
An early prototype of
the CapSense device
The completed CapSense keyboard
coupled with PSoC CY3214 circuit board.
-Create a digital entertainment device using the PSoC circuit board
-Create a user friendly interface for device operation
-Ultimate Motivation: PSoC circuit board is relatively low cost and can serve as a
universal platform for future consumer devices
Source Code:
Sample variables:
int freq;
int time_val;
int out_freq;
struct noteNames{
int C4;
int C4Sharp;
int D4;
-Auditory amplifier
Hypotheses:
Purpose of Project:
A CapSense electric guitar
can be created after overcoming wiring issues.
-PSoC CY3214 circuit board
-Cypress Semiconductor’s PSoC
Research Problems:
The final CapSense keyboard
with PSoC circuit board
Possible Further
Applications:
Hardware Used:
Abstract:
The PSoC (Programmable System on Chip) device is a highly adaptable circuit board that can be programmed to
allow for complete usage of the various onboard components. A PSoC device can be programmed for auditory
output if it has the right components installed. The CY8C24894-24FLXI PSoC board contains a buzzer which allows
for use of the board as an auditory output device. Additionally, the board includes a CapSense (Capacitive Sensor)
component. This CapSense component includes touch sensitive buttons along with a slider which enable the input
end of the project. Utilizing a CY3214 device, an octave of a piano keyboard can be simulated. The base of the
program was written in C programming language on Cypress Semiconductor’s PSoC Designer 5 software. Initially,
the program was written to work with only one board, allowing one full octave. However, with some modification, the
C code can be modified successfully to allow two boards to connect and utilize both CapSense components. In
addition, with even further development and more research, the board was able to be connected to external
CapSense buttons that would serve as keyboards for the full octave to be outputted and also including a “whammy”
slider for whammy effect on notes. With much testing and debugging, the device output was successful, with the
CapSense components utilized to allow for a single full octave, including sharp and flat notes. Since the board was
apt for that kind of customization, we tested it to see if an amplifier would have sustained. The amplifier sustained
and the output was significantly cleaner. The board, with further programming, has the capability to play full songs
with the amplifier. This application of the PSoC device is very promising for future embedded systems design as it
demonstrates the feasibility of user friendly entertainment devices with flexible inputs and outputs. The PSoC is a
revolutionary device that if used for specific uses, may surpass the dominance of multi-purpose personal computers.
Conclusion:
The PSoC board was successfully able to support
CapSense buttons and an 8-bit Pulse Width Modulator
(Auditory Output.) The PSoC CY824094 EVAL board
was able to support two sliders and had enough space
for two more buttons. This board is not suitable for more
than one octave at a time. The external CapSense
buttons had significant noise and are extremely sensitive
to each other and length. Some of the CapSense buttons
had to be assigned to different port’s pins in order to
have them all working. The number of components and
the number of CapSense buttons were inversely
proportional to each other; the more components
placed, the less could be used for CapSense buttons.
The pins were assigned logically to position the wires so
they would not touch each other or else interference
occurred. The wires were then soldered to the copper
tape and the copper tape was attached to the eight-inch
acrylic sheet. The acrylic sheet is non conductive, thus
allowing for capacitive sensing to work. This board
sustained all the external CapSense buttons and the
auditory output.
Acknowledgements:
Thank you to the following:
-Professors:
Rajesh Gupta
Choon Kim
-Teacher Fellow: Shirley Miranda
-T.A.s:
Arash Arfaee
Bridget Benson
-COSMOS staff